<?php


class Page{
	private $total;       // 数据表中的总记录数
	private $listRows;       //每页显示行数 
	//private $limit="Limit 0,10";
	private $uri;
	private $pageNu; //页数
	private $config = array('header'=>"本书",'prev'=>"上一页",'next'=>"下一页",'first'=>"首页",'last'=>"尾页");

	private $listNum=8;

	/*
     * $total
	 * $listRows
	 */

	public function __construct($total,$listRows = 10,$pa=""){ 
		$this->total=$total;
		$this->listRows=$listRows;
		$this->uri=$this->getUri($pa);//->给成员赋值
		$this->page=!empty($_GET["page"]) ? $_GET["page"] : 1;
		$this->pageNum=ceil($this->total/$this->listRows);
		$this->limit=$this->setLimit();

	//	var_dump($this); //输出本类的对象
	}


	private function setLimit(){ 
		return "Limit ".($this->page-1)*$this->listRows.", {$this->listRows}";
	 }//被private修饰的变量和方法，只能在所在的类的内部被调用和修改，不可以在类的外部被访问。在子类中也不可以。如果直接调用，就会发生错误。

	private function getUri($pa){ 
		$url=$_SERVER["REQUEST_URI"].(strpos($_SERVER["REQUEST_URI"],'?')?'':"?").$pa;

		$parse=parse_url($url);


		if (isset($parse["query"])) {
			parse_str($parse["query"],$params);
			unset($params["page"]);
			$url=$parse['path'].'?'.http_build_query($params);
		}

		return $url;

	}


	public function __get($args){
		if($args=="limit")
			return $this->limit;
		else
			return null;
	}//可以在程序中的任何位置（类内、类外）被其他的类和对象调用。子类可以继承和使用父类中所有的公共成员。
	private function start(){ 
			if($this->total==0)
				return 0;
			else
				return ($this->page-1)*$this->listRows+1;
	}
	private function end(){ 
			return min($this->page*$this->listRows,$this->total);
	}

	private function first(){
		$html="";
		if ($this->page==1)
			$html.="&nbsp;&nbsp;<a href='{$this->uri}&page=1'>{$this->config["first"]}</a>&nbsp;&nbsp;";
		else
			$html.="&nbsp;&nbsp;<a href='{$this->uri}&page=".($this->page-1)."'>{$this->config["first"]}</a>&nbsp;&nbsp;";
		return $html;

	}

	private function prev(){ 
		$html="";
		if ($this->page==1)
			$html.="&nbsp;&nbsp;<a href='{$this->uri}&page=1'>{$this->config["prev"]}</a>&nbsp;&nbsp;&nbsp;";
		else
			$html.="&nbsp;&nbsp;<a href='{$this->uri}&page=".($this->page-1)."'>{$this->config["prev"]}</a>&nbsp;&nbsp;&nbsp;";
		return $html;
	}

	private function pageList(){
		$linkPage="";

		$inum=floor($this->listNum/2);

		for ($i=$inum; $i < $inum ; $i++){ 
			$page=$this->page+$i;
			if($page<=$this->pageNum)
				$linkPage.="&nbsp;<a href='{$this->uri}&page={$page}'>{$page}</a>&nbsp;";
			else
				break;
		}

		$linkPage.="&nbsp;{$this->page}&nbsp;";

		for ($i=1; $i < $inum ; $i++){ 
			$page=$this->page+$i;
			if($page<=$this->pageNum)
				$linkPage.="&nbsp;<a href='{$this->uri}&page={$page}'>{$page}</a>&nbsp;";
			else
				break;
		}
		return $linkPage;

	}

	private function next(){
		$html="";
		if ($this->page==$this->pageNum)
			$html.="&nbsp;&nbsp;<a href=\"{$this->uri}&page=".($this->pageNum)."\">{$this->config["next"]}</a>&nbsp;&nbsp;";
		else
			$html.="&nbsp;&nbsp;<a href=\"{$this->uri}&page=".($this->page+1)."\">{$this->config["next"]}</a>&nbsp;&nbsp;";
		return $html;
	}

	private function last(){ 
		$html="";
		if ($this->page==$this->pageNum)
			$html.="&nbsp;&nbsp;<a href='{$this->uri}&page=".($this->pageNum)."'>{$this->config["last"]}</a>&nbsp;&nbsp;";
		else
			$html.="&nbsp;&nbsp;<a href='{$this->uri}&page=".($this->pageNum)."'>{$this->config["last"]}</a>&nbsp;&nbsp;";
		return $html;
	}

	private function goPage(){ 
		return '&nbsp;&nbsp;<input type="text" onkeydown="javascript:if (event.keyCode==13) {var page=(this.value>'.$this->pageNum.')?'.$this->pageNum.':this.value;location=\''.$this->uri.'&page=\'+page+\'\'}" value="'.$this->page.'" style="width:25px"><input type="button" value="GO" onclick="javascript:var page=(this.previousSibling.value>'.$this->pageNum.')?'.$this->pageNum.':this.previousSibling.value;location=\''.$this->uri.'&page=\'+page+\'\'"> &nbsp;&nbsp;';
	}

	function fpage($display=array(0,1,2,3,4,5,6,7,8,)){
		$html="";
		$html[0]="&nbsp;&nbsp;共有<b>{$this->total}</b>{$this->config['header']}&nbsp;&nbsp;";
		$html[1]="&nbsp;&nbsp每页显示<b>".($this->end()-$this->start()+1)."</b>条，本页显示<b>{$this->start()}-{$this->end()}</b>条&nbsp;&nbsp;";
		$html[2]="&nbsp;&nbsp;<b>{$this->page}/{$this->pageNum}</b>页&nbsp;&nbsp;";

		$html[3]=$this->first();
		$html[4]=$this->prev();
		$html[5]=$this->pageList();
		$html[6]=$this->next();
		$html[7]=$this->last();
		$html[8]=$this->goPage();

		$fpage="";

		foreach($display as $index)
			$fpage .= $html[$index];
		return $fpage;
	}
} 

 
?>









